#include "unp.h"

ssize_t write_fd(int fd, void *ptr, size_t nbytes, int sendfd)
{
  struct msghdr msg;
  struct iovec iov[1];

#ifdef HAVE_MSGHDR_MSG_CONTROL
  union {
    struct cmsghdr cm;
    char control[CMSG_SPACE(sizeof(int))];
  } control_un;

  struct cmsghdr *cmptr;
  msg.msg_control = control_un.control;
  msg.msg_controllen = sizeof(control_un.control);
  cmptr = CMSG_FIRSTHDR(&msg);
  cmptr->cmsg_len = CMSG_LEN(sizeof(int));
  cmptr->cmsg_level = SOL_SOCKET;
  cmptr->cmsg_type = SCM_RIGHTS;
  *((int *) CMSG_DATA(cmptr)) = sendfd;
#else
  msg.msg_accrights = (caddr_t) & sendfd;
  msg.msg_accrightslen = sizeof(int);
#endif

  msg.msg_name = NULL;
  msg.msg_namelen = 0;
  iov[0].iov_base = ptr;
  iov[0].iov_len = nbytes;
  msg.msg_iov = iov;
  msg.msg_iovlen = 1;

  printf("write buffer is :%s\n", (char*)(iov[0].iov_base = ptr)); 
  return (sendmsg(fd, &msg, 0));
}
